Как изменить размер MetroMessageBox

Пользовательский контрол MetroMessageBox:

using MetroFramework;
using System;
using System.Drawing;
using System.Media;
using System.Threading;
using System.Windows.Forms;

Класс MyMessageBox:

public class MyMessageBox
{
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message)
    { return Show(owner, message, "Notification", 211); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, int height, int width = 0)
    { return Show(owner, message, "Notification", height, width); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title)
    { return Show(owner, message, title, MessageBoxButtons.OK, 211); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, int height, int width = 0)
    { return Show(owner, message, title, MessageBoxButtons.OK, height, width); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons)
    { return Show(owner, message, title, buttons, MessageBoxIcon.None, 211); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons, int height, int width = 0)
    { return Show(owner, message, title, buttons, MessageBoxIcon.None, height, width); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="icon"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons, MessageBoxIcon icon)
    { return Show(owner, message, title, buttons, icon, MessageBoxDefaultButton.Button1, 211); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="icon"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons, MessageBoxIcon icon, int height, int width = 0)
    { return Show(owner, message, title, buttons, icon, MessageBoxDefaultButton.Button1, height, width); }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="icon"></param>
    /// <param name="defaultbutton"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultbutton)
    {
        return Show(owner, message, title, buttons, icon, defaultbutton, 211);
    }
    /// <summary>
    /// Shows a metro-styles message notification into the specified owner window.
    /// </summary>
    /// <param name="owner"></param>
    /// <param name="message"></param>
    /// <param name="title"></param>
    /// <param name="buttons"></param>
    /// <param name="icon"></param>
    /// <param name="defaultbutton"></param>
    /// <param name="height" optional=211></param>
    /// <returns></returns>
    public static DialogResult Show(IWin32Window owner, String message, String title, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultbutton, int height, int width = 0)
    {
        DialogResult _result = DialogResult.None;
        if (owner != null)
        {
            Form _owner = (owner as Form == null) ? ((UserControl)owner).ParentForm : (Form)owner;
            switch (icon)
            {
                case MessageBoxIcon.Error:
                    SystemSounds.Hand.Play(); break;
                case MessageBoxIcon.Exclamation:
                    SystemSounds.Exclamation.Play(); break;
                case MessageBoxIcon.Question:
                    SystemSounds.Beep.Play(); break;
                default:
                    SystemSounds.Asterisk.Play(); break;
            }
            MetroMessageBoxControl _control = new MetroMessageBoxControl();
            _control.BackColor = _owner.BackColor;
            _control.Properties.Buttons = buttons;
            _control.Properties.DefaultButton = defaultbutton;
            _control.Properties.Icon = icon;
            _control.Properties.Message = message;
            _control.Properties.Title = title;
            _control.Padding = new Padding(0, 0, 0, 0);
            _control.ControlBox = false;
            _control.ShowInTaskbar = false;
            _control.TopMost = true;
            _control.Size = new Size(width == 0 ? _owner.Size.Width : width, height);
            _control.Location = new Point(_owner.Location.X + (_owner.Width - _control.Width) / 2, _owner.Location.Y + (_owner.Height - _control.Height) / 2);
            _control.ArrangeApperance();
            int _overlaySizes = Convert.ToInt32(Math.Floor(_control.Size.Height * 0.28));
            _control.ShowDialog();
            _control.BringToFront();
            _control.SetDefaultButton();
            Action<MetroMessageBoxControl> _delegate = new Action<MetroMessageBoxControl>(ModalState);
            IAsyncResult _asyncresult = _delegate.BeginInvoke(_control, null, _delegate);
            bool _cancelled = false;
            try
            {
                while (!_asyncresult.IsCompleted)
                { Thread.Sleep(1); Application.DoEvents(); }
            }
            catch
            {
                _cancelled = true;
                if (!_asyncresult.IsCompleted)
                {
                    try { _asyncresult = null; }
                    catch { }
                }
                _delegate = null;
            }
            if (!_cancelled)
            {
                _result = _control.Result;
                _control.Dispose(); _control = null;
            }
        }
        return _result;
    }
    private static void ModalState(MetroMessageBoxControl control)
    {
        while (control.Visible)
        { }
    }

Применение:

MyMessageBox.Show(Owner, "Приветствую сообщество !", "Приветствие", 120, 300);